Wear acid resistant gloves, goggles and suitable face and skin protection. Before use, always test an inconspicuous area for suitability. Do not use on acid sensitive surfaces. Dilute 1 part with 4 parts water and brush this solution onto the surface, leave in contact for at least 5 minutes, do not allow to dry out. Agitate surface to remove stubborn marks, rinse thoroughly by spraying with clean water and give a final rinse with a mild alkaline solution. Rinse applicators in water and dispose of after use. Not to be used on stainless steel or vitreous enamel.